Injection molding, method for producing injection molding and die for injection molding

Abstract

In order to eliminate post-molding mounting of a bulb 3 and a terminals 7 using a socket, when molding of a side turn signal blinker 1 in a manner of die slide injection, a process to mount the bulb 3 and the terminals 7 to a housing 4 is provided between a process to separate a first and second dies 9 and 10 from each other, which has carried out a primary injection molding of a lens portion 2 and the housing 4 as semi-finished products, and a process in which the dies are slid, the lens portion 2 and the housing 4 are butted and the secondary injection is carried out; thereby post-molding mounting of the bulb and the terminals is eliminated and the side turn signal blinker 1 in which the bulb 3 and the terminals 7 have been inserted, is obtained.

1 . A manufacturing method of an injection molded article, comprising the steps of; molding a plurality of semi-finished products respectively by a primary injection, butting said molded semi-finished products, and carrying out a secondary injection on the butted portion to integrate said molded semi-finished products, wherein a process in which a part is mounted to a part mounting portion of at least one semi-finished product formed in said primary injection is provided between said primary injection process and said butting process.  
     
     
         2 . An injection molded article structured by molding a plurality of semi-finished products respectively by a primary injection, butting said molded semi-finished products, and then carrying out a secondary injection on the butted portion to integrate said molded semi-finished products, wherein a mounting portion for mounting a part is integrally formed in at least one semi-finished product molded by said primary injection.  
     
     
         3 . A set of dies for an injection molded article for integrally forming an injection article by molding a plurality of semi-finished products respectively by a primary injection, mounting a part to at least one of the molded semi-finished products, and then butting the semi-finished products to each other and carrying out a secondary injection on the butted portion, wherein, in the dies which mold the semi-finished products in said primary injection, a mounting-portion mold for forming a mounting portion for the part is formed.  
     
     
         4 . A set of dies for an injection molded article according to  claim 3 , wherein the part which is mounted to the semi-finished products is an electric part having terminals, and in the dies to mold the semi-finished products in the primary injection, in addition to the mounting-portion mold for forming the mounting portion for the electric part, are formed an insertion hole mold for forming an insertion hole for the terminals protruding from said electric part and a regulating portion for regulating injection of the primary injection material into the insertion hole mold in the primary injection process.